Process for enameling leather.



, To all whom it may co /teem:

' UNITED asrrx'rps iATENT OF ICE.

BYRON B. GOLDSMITH, on NEW Yoax, N. Y.

PROCESS Eon ENAMELING LEATHER.

Specification of Letters Patent.

Patented Jan. 12, 1909.

7 Application filed November 28, 1903. Serial No. 183,021'.

Be it knownthat I, BYRON B. GoLnsMrrH,

a citizen of the United States, residing in the citya'ndState of N ew York, have invented a new and useful Improvement in Processes for Enamelintg Leather, of which the follo-w in is a speci cation.

y invention has reference to an improvement in the processof manufacturing patent or enameled-leather. The process of manufacturing patent leather, which is now still in use to a considerable extent, consists in the repeated aplication to the leather or fibrous material of ayers of linseed oil varnish, whether mixed or unmixed with suitable pigments. It has also more recently been proposed to coat leather, in the manufacture of patent leather,

with a preparatory coating of pyroxylin mixed with other substances and to superimpose a coating ofenamel or linseed Oll varnish thereu on to produce the gloss. In carout t is last mentioned process; however, a certain. difiiculty is encountered.

- After the linseed oil varnish has been applied upon the "yroxylin coating and has been allowed to ry, it has beenfound that the oil frequently dries in drops,as'distinguished from a continuous unbroken surface. Es ecially is this the case when the pyroxy in compound has completely covered up the tically a dr ing in rops does not take place at once,-

. it, just as water would be.

where it is possible to get the linseed oil varfibrous structure of the base, forming pracyroxylin surface. Even if this it 1s found to take lace when the coated surfaces, as is genera y necessary, are placed in a drying room to complete the drying. The reason for this action seems to be found in the fact that-the linseed oil varnish does, not unite with the pyroxylin base and is shed by tlon. If now the fibroussurface has been Even in the cases coated with one ormore layers of a coating in such a manner that the coating last applied is a coating consisting of or containing pyroxylin or a pyrox'ylin compound, I apply u on this pyroxylin surface one or more g oss giving coatings consisting of a mixture of linseed oil varnish or a drying oil and a solution of pyroxylin. I thus obtain the gloss which has heretofore been produced by li'n seedoil or drying oil varnishes and additionally effect the result that the coat of the mixture of the linseed oil varnish and pyroxylin 1 will intimately unite with the under surface of the yroxyljn or pyroxylin compound to which 1?, is applied. By this means I avoid the dryin in drops of linseed oil varnishes when applied to an under surface containing or consisting of pyroxylin and I produce a finished product in which there is no tendency for the coatin containing linseed oil to flake off or to cr'aci, as has heretofore been the case when drying oil varnishes have been applied to an under surface containing pyroxvhn.

- While I have spoken of a mixture of linseed oil or drying oil varnish and a solution of pyroxylin as a coating to be applied to an under surface. containing pyroxylin for the purpose of increasing the gloss, it is manifest that other substances, such as substances which increase the flexibility of the coating, like non-drying oils, or pigments and the like, can be added to this mixture oflinseed oil varnish and a solution of pyroxylin for giving appropriate qualities to the gloss I coating.

To give a specific example, I may prepare a solution of pyroxylin in amyl acetate taken by itself or mlxed with benzin or turpentine.

Thus I may add six ounces of pyroxylin to one gallon-of amyl acetate. To 80 ,cubic eentimeters of this solution, I may add 80 cubic centimeters of linseed oil orlinseed oil varnish, that is to say linseed 'oil which has been boiled with suitable driers.

tions of pyroxylin and drying oil varnish can be varied within wide limit, it being under stood that the greater the proportion of dryirrg oil, the greater, in general, will be the gloss which the coating imparts. Nor is it necessary, in case a number of coats of the mixture of pyroxylin and drying oii varnish are applied, that the proportions of the ingredients in each coating be the same. I thereupon take the skin and apply one or more suitable At the same time, it is to be understood that the propor-- coatings'insuch a manner that the coating last to be applied consists of or contains pyroxylin. To. this under pyroxylin surface,

to produce any finis for some days beforeit can be shipped, 1n

order to remove the stickinessfrom the I surface. This stickiness is due to the linseed oil varnish on the surface. When, however, such surface coating has pyroxylin mixed therewith, it is generally unnecessary to expose it to sunlight unless there is a. very large .piplportion of oil in the last coating. Since ght is not always to be had, the oldmethod is often interfered with by weather with'not perhaps the samedegree. of utility, -I may mix my linseed oil'varnish with a conditionsand requires a large plant, whereas by my process'I may causethe last coat'to be applied" to consist of such mixture'of a solution of pyroxylin and a drying oil varnish, as Will not rendersun dryin of the 'productnecessary after the final ba 'ng. I

may also state that in some cases, although solvent of pyroxylin instead of with a solution of pyroxylin and then proceed in the manner hereinhefore described with reference'to the mixture of pyroxylin and drying-v oil varnish. l

' It is almost unnecessary to addthat I may not use resin as a form of drying oil to mix since it won another advantage: of my with pyroxylin to apply upon the pyroxylin coat upon the leather surface. A resin varnish for gloss giving purposes is useful on 1 articles of wood andthe like but-could not be used in the present art of enameling leather d cause the leather to crack. I claim,.

. 1. The. process of enameling leather which consists in supplying it witha surface containing pyroxy n and then applyingthereto a solution containing pyroxyhn and a drying oil, substantially as described.

2. The process of enameling leather which.

consists in supplying it with a surface con- 'n and then applying thereto a solution containing pyroxylin, a drying oil taining ,pyroxy and a flexibility-imparting substance, substantially as described.

4 3. The method of enameling leather which consists in sup lyingit with a surface con-- taining pyroxy 'n, and then applying thereto a mixture consisting of a solvent of pyroxylinand' a drying oil, substantially as described 4. Enameled leather having among its coats a coating containing pyroxylin, and a coat containing a drying 011 and pyroxylin superposed thereon, substantially ,as described.

5. Theprocess of enameling leather which consists in supplying it with, asurface conlinseed oil,..substantial yas described.

In testimony whereof I have signed my name to this specification in the presence of 'two subscribing witnesses.

' BYRON B. GOLDSMITH Witnesses:

M. TET'zLoFF, F. T. CHAPMAN.

.taining pyroxylin and then'ap lying thereto a solution containing yroxy 1n and 'boiled' 

